34 Field Instrumentation GEN Rev)
2.2 Parts of pressure instruments Pressure instruments are functionally divided into two parts 1. Sensors 2. Transducers 2.3 There are two basic kinds of sensors 1. Wet sensors: contain liquid that responds to the pressure.
2. Dry sensors: use an elastic element that responds to pressure. Pressure instruments can be divided into two major categories.
1). Those that employ mechanical means to detect and communicate pressure information from the process and secondary device
2). Those that rely on electrical phenomenon or relationship
to carryout this function Mechanical pressure measurement systems In mechanical systems pressure is determined by balancing a sensor against the unknown force. This can be done by another pressure or force.
Pressure balance sensors The two most common pressure balance sensors are I. Manometers II. Dead weight tester.
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